Impex allows you to import users via a csv file. I imagine that you could import them into a custom user group specifically for paid users.
When you recieve a payment, you could manually add a user to that usergroup going forward. Some admins have set it up so that a validation code can be entered into a custom profile field which automatically add them to the correct usergroup. There is a mod here for that last part.
I think (I am not sure) that you can also set up a cron job to automatically remove users after a certain date. I know you can remove them after being in that group for a x days / months / years.
The best option, might be to use vbulletin's payment system. It will keep track of a lot of that info you but I guess it depends on your own needs and what your existing db ties into today.
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